Roller-mill



I (NoModeL) 3SheetsSheet 1.

S. B. RIGKERSON.

ROLLER MILL;-

No. 278,273. Patented May 22,1883.

- '3 SheetsShet 3.

S. B. RIOKERSON.

(No Model.)

ROLLER MILL.

w z M w w M n H 1 ifl t W L J 'SHERMitfi n. incknnsomfor GRAND shims; MICHIGAN.

. ssmmcmpngf a g gait ta ti r;seat 8,27 ji 'tedira 22,1383, "J T .Applicationfiledhll'archfi,1e81,. (hiomodcli 1 1 Q To all with ttlmdyycoitcern;

B it known that ,I; SHERMAN B. Ricx nn- SQN, a citizen of the United States, residing at Grand Rapids, in the county of Kent and State 5 of Michigan, have invented certain new and useful Improvements in Roller-Mills; and I dohereby declare the following to be a lull, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to makeand use the same.

' My invention relates to certain improvements in'roller mills in which two spirallyg'rooyedrolls or cylinders are placed side by side and turn toward each other, one roll movg ifig at a faster speed than the other; and the objects of myinvention are to prevent cutting of the grain, and to secure a uniform continuous crushing thereof while effecting the granulation of the grain, and removing the creasedirt and germ. I g

, My improvementsconsist in aspecial form of dress for each roll, by which these objects are perfectly accomplished.

In the accompanying'drawings, which make part of this specification, Figure 1 is a section of the face of the slow-moving roll, showing thevribs and grooves constituting the dress. 2 is a similar view of the fast-moving roll. Fig. 3 is an outline view of adjacent portions of the two rolls, illustrating the relative positions? of the ribs and grooves, and the form of the pockets formed by the said ribs and grooves when the rolls are moving at the same speed in the direction indicated. Fig. 4 is a similar view when therolls are moving at different 7 speeds, as I prefer to use them. Fig. 5 is a perspective view of the fast-moving roll. Fig. 6 is a similar view of the slow-moving roli. Fig. 7 is an and elevation of a portion of a roller-mill, showing the-manner of driving the slow-speeded rollers. Fig. 8 is a view of the belting mechanism for the fast-speeded rollers on the opposite side from the view shown in Similarlette'rs designate corresponding parts in all the figures. 1

The two rolls move, preferably, at different rates of speed, one roll,'A, being moved at a hniformly-faster speed than the other roll, B.

'50 I prefer to have the roll A move at double the speed ofthe roll B, and have shown in the rate of speed.

double the width of the faces of the ribs.

drawings such proportions of the :ribs'and grooves of the two rolls-as'are suitable tothis peculiar form' of dress. The fast roll A; has a Each rollis provided with a b, perpendicular to said face and forming a.

sharp cutting-edge, and-an opposite straight side, c,inclinedtosaid face and forming a feathered edge. The inclined side-c runs straight.until it meets the straight perpendiciilar side I) of the adjacent rib, making a sharpcornered pocket therewith This pocket serves to receive the crushed or granulated grain and protect it from further crushing. The inclination'of the side 0 to the face a may be at any angle desirable, that shown in the drawings being a proper one. The ribs of the slowmoving roll B are formed of a plain outer sur-' face, (I, and two inclined sides, 0 c. These two sides e e are of the same or nearly equal length,

and make substantially the same angle with the face 01, the relative lengths and angles shown in the drawings being suitable ones. The faces and grooves of the roll A should be of the same width as the faces and grooves of the roll B. The relative widths of the faces and grooves should be proportioned to the relative speeds of the two. If, as I prefer and show, the speed of roll A is double that of the roll B, the width of the grooves shonldbe As a result of this arrangement, it follows that no grain can pass between the rolls without bein g subjected to the crushing and rubbing actions of the faces of the ribs, and a uniform continuapproach the blunt cutting-edges of the ribs of the roll B, and as the falling grain is caugh t by said edges, neither of the edges being sharp, it is in no danger of being cut. The grain is then drawn betweentbefacesof the adjacent ribs, is crushed and rubbed, and thereby cleansed of crease dirt and germ, and drops into the pockets of'roll A below, where it is protected from further crushing, and from being ground and pulverized with the refuse matters. All the grain and refuse are caught in the pockets of the roll A,.as the grooves B are of such shapethat they will not hold the grain, all particles falling into its grooves beiug shed into the pockets of the roll A, as will be clearly seen in the drawings.

For giving the required diflerential motion to the rolls A B the belting mechanism shown in Figs. 7 and 8 may be used. The belting mechanism shown is-for driving two sets of rolls, A A, B B. ()n the main driving-shaft O are fixed pulleys D E of different diameters, depending on the relative speed desired. The larger pulley, E, by suitable belting, drives the pulleys]? F which rotate the fast-speeded rolls A A, and the smaller pulley, D, drives the slow'speedcd rolls B B through the pulleysG G and connecting belting. H H are tighteniug-pulleys.

That I claim as my invention is- 1. In a roller-mill, the combination of two rolls, one being provided with ribs and pockets, each rib having a plain outer surface, one straight perpendicular side, and one straight inclined side, and the other being-provided with ribs and grooves, each rib having a plain outer face and two straight sides inclined at substantially the same angle, as herein set forth. g

2. In a roller-mill, the combination of two rolls running at different speeds, one being provided with ribs and grooves, each rib having one plain outer face and 'one straight in the other being provided with ribs clined face,

and grooves, each rib having a plain outer face and two straight sides inclined at substantially the same angles, so arranged and operated that the grain shall be caught between the feathered edge of the fast-moving roll and the upper blunt edge of the slowmoving roll,- substantially as and for the pnr: pose herein specified.

3. The combination of the rolls adapted to be rotated at different speeds, the fast roll provided with a'dress composed of'rihs'andgrooves, each rib having a plain outerface, one straight perpendicular side, inclined side, and the slow roll provided with a dress com posed of ribs and grooves, each rib havinga plain outer face and two'sides inclined at substantially the same angle, the faces,

and one straight j and grooves of one roller being equal in width I to the faces and grooves of the other roller,-

and the relative width of the faces and grooves being proportioned to the relative speeds of the two rolls, substantially as and for the purpose herein specified.

In testimony whereof I afiix my signature in presence of two witnesses.

SHERMAN e. RIGKERSON.

\Vitnesses i 

